Series 174A Boiler Pressure Relief Valves are used in hot water heating
and domestic supply boiler applications to protect against excessive
pressures on all types of hot water heating supply boiler equipment. It
consists of a bronze body construction with NPT threaded female inlet
and NPT threaded female outlet (drain) connections, non-metallic
disc-to-metal seating, stainless steel spring, and test lever. Series
174A resists corrosive water conditions, sticking and freezing, and
prevents water and sediment from being trapped in the seat. It is
designed for emergency safety relief and shall not be used as an
operating control. Standard Pressure Setting: 30psi (206.9 kPa),
Pressure Range: In 5psi (34.5 kPa) increments from 30 to 150psi (2 to 10
bar) with corresponding high ratings from 650,000 to 14,370,000 BTU/hr.Standard Pressure Settings: 30psiFitting: 3/4" FPT